@book { EGovernmentundBehrdenportale,
    title = "E-Government und Behördenportale",
    author = "Kristina {Wahl}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832459826",
    url = "https://m.diplom.de/document/221430"
}